1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
|
/*
* Copyright 2004 The WebRTC Project Authors. All rights reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
#ifndef RTC_BASE_SOCKETADAPTERS_H_
#define RTC_BASE_SOCKETADAPTERS_H_
#include <map>
#include <string>
#include "rtc_base/asyncsocket.h"
#include "rtc_base/constructormagic.h"
#include "rtc_base/cryptstring.h"
#include "rtc_base/logging.h"
namespace rtc {
struct HttpAuthContext;
class ByteBufferReader;
class ByteBufferWriter;
///////////////////////////////////////////////////////////////////////////////
// Implements a socket adapter that can buffer and process data internally,
// as in the case of connecting to a proxy, where you must speak the proxy
// protocol before commencing normal socket behavior.
class BufferedReadAdapter : public AsyncSocketAdapter {
public:
BufferedReadAdapter(AsyncSocket* socket, size_t buffer_size);
~BufferedReadAdapter() override;
int Send(const void* pv, size_t cb) override;
int Recv(void* pv, size_t cb, int64_t* timestamp) override;
protected:
int DirectSend(const void* pv, size_t cb) {
return AsyncSocketAdapter::Send(pv, cb);
}
void BufferInput(bool on = true);
virtual void ProcessInput(char* data, size_t* len) = 0;
void OnReadEvent(AsyncSocket* socket) override;
private:
char * buffer_;
size_t buffer_size_, data_len_;
bool buffering_;
RTC_DISALLOW_COPY_AND_ASSIGN(BufferedReadAdapter);
};
///////////////////////////////////////////////////////////////////////////////
// Interface for implementing proxy server sockets.
class AsyncProxyServerSocket : public BufferedReadAdapter {
public:
AsyncProxyServerSocket(AsyncSocket* socket, size_t buffer_size);
~AsyncProxyServerSocket() override;
sigslot::signal2<AsyncProxyServerSocket*,
const SocketAddress&> SignalConnectRequest;
virtual void SendConnectResult(int err, const SocketAddress& addr) = 0;
};
///////////////////////////////////////////////////////////////////////////////
// Implements a socket adapter that performs the client side of a
// fake SSL handshake. Used for "ssltcp" P2P functionality.
class AsyncSSLSocket : public BufferedReadAdapter {
public:
explicit AsyncSSLSocket(AsyncSocket* socket);
int Connect(const SocketAddress& addr) override;
protected:
void OnConnectEvent(AsyncSocket* socket) override;
void ProcessInput(char* data, size_t* len) override;
RTC_DISALLOW_COPY_AND_ASSIGN(AsyncSSLSocket);
};
// Implements a socket adapter that performs the server side of a
// fake SSL handshake. Used when implementing a relay server that does "ssltcp".
class AsyncSSLServerSocket : public BufferedReadAdapter {
public:
explicit AsyncSSLServerSocket(AsyncSocket* socket);
protected:
void ProcessInput(char* data, size_t* len) override;
RTC_DISALLOW_COPY_AND_ASSIGN(AsyncSSLServerSocket);
};
///////////////////////////////////////////////////////////////////////////////
// Implements a socket adapter that speaks the HTTP/S proxy protocol.
class AsyncHttpsProxySocket : public BufferedReadAdapter {
public:
AsyncHttpsProxySocket(AsyncSocket* socket, const std::string& user_agent,
const SocketAddress& proxy,
const std::string& username, const CryptString& password);
~AsyncHttpsProxySocket() override;
// If connect is forced, the adapter will always issue an HTTP CONNECT to the
// target address. Otherwise, it will connect only if the destination port
// is not port 80.
void SetForceConnect(bool force) { force_connect_ = force; }
int Connect(const SocketAddress& addr) override;
SocketAddress GetRemoteAddress() const override;
int Close() override;
ConnState GetState() const override;
protected:
void OnConnectEvent(AsyncSocket* socket) override;
void OnCloseEvent(AsyncSocket* socket, int err) override;
void ProcessInput(char* data, size_t* len) override;
bool ShouldIssueConnect() const;
void SendRequest();
void ProcessLine(char* data, size_t len);
void EndResponse();
void Error(int error);
private:
SocketAddress proxy_, dest_;
std::string agent_, user_, headers_;
CryptString pass_;
bool force_connect_;
size_t content_length_;
int defer_error_;
bool expect_close_;
enum ProxyState {
PS_INIT, PS_LEADER, PS_AUTHENTICATE, PS_SKIP_HEADERS, PS_ERROR_HEADERS,
PS_TUNNEL_HEADERS, PS_SKIP_BODY, PS_TUNNEL, PS_WAIT_CLOSE, PS_ERROR
} state_;
HttpAuthContext * context_;
std::string unknown_mechanisms_;
RTC_DISALLOW_COPY_AND_ASSIGN(AsyncHttpsProxySocket);
};
///////////////////////////////////////////////////////////////////////////////
// Implements a socket adapter that speaks the SOCKS proxy protocol.
class AsyncSocksProxySocket : public BufferedReadAdapter {
public:
AsyncSocksProxySocket(AsyncSocket* socket, const SocketAddress& proxy,
const std::string& username, const CryptString& password);
~AsyncSocksProxySocket() override;
int Connect(const SocketAddress& addr) override;
SocketAddress GetRemoteAddress() const override;
int Close() override;
ConnState GetState() const override;
protected:
void OnConnectEvent(AsyncSocket* socket) override;
void ProcessInput(char* data, size_t* len) override;
void SendHello();
void SendConnect();
void SendAuth();
void Error(int error);
private:
enum State {
SS_INIT, SS_HELLO, SS_AUTH, SS_CONNECT, SS_TUNNEL, SS_ERROR
};
State state_;
SocketAddress proxy_, dest_;
std::string user_;
CryptString pass_;
RTC_DISALLOW_COPY_AND_ASSIGN(AsyncSocksProxySocket);
};
// Implements a proxy server socket for the SOCKS protocol.
class AsyncSocksProxyServerSocket : public AsyncProxyServerSocket {
public:
explicit AsyncSocksProxyServerSocket(AsyncSocket* socket);
private:
void ProcessInput(char* data, size_t* len) override;
void DirectSend(const ByteBufferWriter& buf);
void HandleHello(ByteBufferReader* request);
void SendHelloReply(uint8_t method);
void HandleAuth(ByteBufferReader* request);
void SendAuthReply(uint8_t result);
void HandleConnect(ByteBufferReader* request);
void SendConnectResult(int result, const SocketAddress& addr) override;
void Error(int error);
static const int kBufferSize = 1024;
enum State {
SS_HELLO, SS_AUTH, SS_CONNECT, SS_CONNECT_PENDING, SS_TUNNEL, SS_ERROR
};
State state_;
RTC_DISALLOW_COPY_AND_ASSIGN(AsyncSocksProxyServerSocket);
};
} // namespace rtc
#endif // RTC_BASE_SOCKETADAPTERS_H_
|
